Melt Network Reorientation and Crystallographic Preferred Orientation Development in Sheared Partially Molten Rocks

Melt Network Reorientation and Crystallographic Preferred Orientation Development in Sheared Partially Molten Rocks

We investigated the co‐evolution of melt, shape, and crystallographic preferred orientations (MPOs, SPOs, and CPOs) in experimentally deformed partially molten rocks, from which we calculated the influence of MPO and CPO on seismic anisotropy. Olivine‐basalt aggregates containing 2 to 4 wt% melt wer...

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Veröffentlicht in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2023-09, Vol.24 (9), p.n/a
Hauptverfasser: Seltzer, Cassandra, Peč, Matěj, Zimmerman, Mark E., Kohlstedt, David L.
Format: Artikel
Sprache:eng
Schlagworte:
Anisotropy
Basalt
Deformation
Direction
experimental rock deformation
Lava
melt bands
melt network orientation
microstructure
Olivine
partially molten rocks
Properties
rheology
Rock
Rocks
Sample preparation
Seismic activity
Shape
Shear
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Zusammenfassung:We investigated the co‐evolution of melt, shape, and crystallographic preferred orientations (MPOs, SPOs, and CPOs) in experimentally deformed partially molten rocks, from which we calculated the influence of MPO and CPO on seismic anisotropy. Olivine‐basalt aggregates containing 2 to 4 wt% melt were deformed in general shear at a temperature of 1,250°C under a confining pressure of 300 MPa at shear stresses of τ  ≤ 175 MPa to shear strains of γ  ≤ 2.3. Grain‐scale melt pockets developed a MPO parallel to the loading direction by γ  
ISSN:1525-2027
1525-2027
DOI:10.1029/2023GC010927